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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06932ae60b4f2508a18c6785cf8a71cdfa13a625859e8dc5f535ad7b4dfc1fca' 
  AND token = 'q5w9+DSD9ByErU4gQ9Ggqmu9rhZdEHKlQsHlUnNT+2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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