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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986d107222786f5306d739cbe531ec78ab46f9161bb69e2934709e956b8d9b7b' 
  AND token = 'T7ETQqP5R1+m9BPelkCo4w8JETCN9wND9xBbAMbGczY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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