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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7d23a367491385b3c8b9f9895ec30d88e5e0112965c8dfe3a8e36e2f2c1252' 
  AND token = 'etNXIhl2y0m/eTlC1hPavFdu5hsKSoFcst3JHB0g1vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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