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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc783665067f7d64e8aa4944d53c0b5d142534cdda0ab3de6c97d01f16c90b54' 
  AND token = 'Jfcbp68rl19WWJd/D4SbwGJY5S8fl/qalKm5kQlLmyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}