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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d9aa11cdc186b85af1ba720ef424fdccb5ea72cb7a4c3d24d3c06f3aaa29c5' 
  AND token = 'LKiRKqeft0Nc9DNBZHIjbROok/bZH01X63DRQZRDzyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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