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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a10af136015c77f28d460d90234d7a29a2c1796d51f875e115621391962a80' 
  AND token = 'II1yk/+MDwKG8z9aRRdYpmNBQ4yMZ4wZSbEQJi3mv5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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