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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96085414813a597b4f39192c9d9487d577929cce303a4f9c2ada00270ca701a7' 
  AND token = '6Bc8pGLFG1J2LUNeMvRM4pEQNZkUHJOlgSoMHwEFblw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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