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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4bc9edb2cb420ddd576319a615a453d295fc9f4633c479a81fef24a0dcba30' 
  AND token = 'n1C6c/MAmJbhcBirvstMMNAaeZtRJS+bpScvotqvUKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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