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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f848b0dfa1ac3c5078388c72267cb4edd8d5db393faaf95f1e04b11d1993d0ef' 
  AND token = 'S1JMuzSOpOnTeIePZ80xIrZmkW8iB9880igYIQ87dpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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