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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc7617f9309229009e10cd750dfd0f2b16d7257f099c580684242c7ad28229c' 
  AND token = 'BTMyJTtc8fY405HPVWQSt5AmqGz29KlTW9qaOY+PYyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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