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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e31f9ef2f27367d5090e4d9fe264d772ca14509386c6a95e1d2c8ece550611' 
  AND token = 'rKIofbMplm0jDhNuSKqzyxyCii44JPN0DDjlKNDZfq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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