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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fa7426b8df9b966092cd7473143be137931e8b8b5f7f7b545dce94bcc84e84' 
  AND token = 'FykfcRItKs7KjPPM8FZR8bIP8yOgvyaPBPgYxydL3n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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