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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e233ca048fbb1ce97d45524d62705fd2db1b186f88d3d23afbbf7daf8f2c5abc' 
  AND token = '5t6xE9yutYlCryG6fC50A+HXySKml8LgECuHz69+b2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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