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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fca677aeb2e32d61d9399dd489b691d6073609bd8ac6f8a169108420ffe7de1' 
  AND token = 'mZXdHb7OOVq+oNUJSia3AYnm1x43aeF313Nc7vWct+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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