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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4924566205df9397ef94c8faab9644040e7cac5a8ee970b8b5a4f7c6f9096e8a' 
  AND token = 'QFhVmDbfeXeuTtTb0p/SDXvqxpHKLU9f7r5zGv8mWn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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