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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1188daac7086ebc30ce877bd16058543e313d56107bee0fbbb2702f387e9e298' 
  AND token = 'arUBD58D1UuRiLICXI3wR6mcrxf0huTKBaN2gFpI6jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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