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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bea0a69e8a4597d59b2f6d3ccc0077cc1099bc93d9010f980df64b73f1140d0' 
  AND token = 'EEdB1dorcy18aBqxxojsu2b0Of7I8s4oyk3++YZ+h+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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