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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4bd54297d51e485ea85c2489c92a352a14e6cb355bf1bae587f4c6e23e40fe' 
  AND token = '+brN+0XO4ALVPDrid5sdYpC+kgUqMcryhG59KoD7hc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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