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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb015733b67425e2c8e9d380096a2f73149d1b1b7747a8ec731aecd0702c702f' 
  AND token = 'rgrGH67D4jJFZiYrlKwaH9DErI4IGbDtAIzywqV4mvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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