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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a931a4e104ea591e5e08b2c1eee1e4c8fbac41e7d900df31fdccc1a657d49939' 
  AND token = 'ahEQed3TpcZ25Rq3y4eFlCMUdvtEONjDyaT1qNb/V6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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