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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca200b2c2f97444763b64f70eb9c5b12cb642cd25ac2a78f0e6659c5c6e36eb' 
  AND token = 't0na3agozgmCRV7Zz4Qo2/IVQa+tfJtStZ+DhhQqRNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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