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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657a29b419bec52807eae1bc87331600762a7dfdf32f29dcad318b1fcc81b7f2' 
  AND token = '8SgiKZSvO1EoVtVZNN2JrXR6o7dsisJPssJoJVfKonI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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