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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc5c1c9aeac18f79b67de343fade0c6fe46e83b63c56f38473ecc57f304166e' 
  AND token = 'kVPu/s5d8b1O3lDebXKRFrcloJdudJjfCxpPjckjLWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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