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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf2b6a2398d2e10fd0c6f16b64c331ba00738a8ae286cc3546edcb72dfe47c2' 
  AND token = 'SoeWyauIXhau5Tr9HGjfNxakrzR2vvZoTMLDi5cnEqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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