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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3824c6fa06bc8accb613be52a3918c7984270e34d7bc64e1c249ba3c657535a3' 
  AND token = 'kWUODK4Tokl6Defn67lPt2aHbivDIeSaYb0rvgVxuo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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