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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8681e4ce39fc7185eefdea048b2e275adc236cb45ffcdbd279a5b1c7e84b6645' 
  AND token = '76UKBpF6XmyQiVGjj7s/AdtVwb9gQzLwbILUEyM2UA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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