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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f6d733577af7f89fd08a9298f1c8faa7e0bdddd14c116d2cc498f0ad5ab530' 
  AND token = 'EIF+3su6gEhJXNCaAnc491RBJorZ0RVwRiee/5Ypguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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