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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01336924a19d8130cad08f0bc6174b8e5394bf8eeed8c2b2d4875ad1f53fdb7a' 
  AND token = '6AgMAoGghn44nHJYZF79M87K95EqCELNp32S1usm1LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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