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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e608c84ac34816f71c8560ffa6c26b8f59514c50d03ac6d54773e1acc76d48d' 
  AND token = 'zTDKiZgoTGdxqffY1BBDvcDHHDX/aGb5MrrCBTC4r/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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