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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5135a93724f58562ececda963f748c64a4bb63be8daee4281358b5a2c5e92bd3' 
  AND token = '/ljTh4XGnyz75ch+3aH2MKXDuG7u41oePZ/ior0FcA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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