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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8856d40b96cde881f335690ef8c6888f803ce0e1ba7a7ddbb0c88d4e1a8e2be0' 
  AND token = 'AH+iQRaq82AiMa3Lu0ubhZNI7BTvl2ZG9Hx9iFqXB50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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