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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb170dafe554a86b29b4b0c65f394bf1a29320d5a0e37b9697bc96dc6b461d6a' 
  AND token = '2gcV2D59Y1whQTGxMUEJWOXTJ11KNzlGK/xQIXAD13A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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