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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467d269921bb2c5351b3bc88537d035460ef1f38d59e3920b346b2957092057c' 
  AND token = 'Hw1zMiiJlK4teNrS4eSR2Agy9yTJgXsJ7ILPyII+KYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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