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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0787873e66756d2b9aa7d058def8a8076307d6a40394100abdaf3d99a212633f' 
  AND token = 'BZ9u48O3YqtI1v6iDZbZMeXELc6opDDWldRT6HLIPTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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