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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7b8e3e62544a78d86607b5075927ac06bb719fe2940511437915700fc5817d' 
  AND token = 'mKfPJLD06UqCXUNSt/o8D0vCiyBKxentDqy/MnB9WSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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