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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f410854b9c852d7df6adb589fc0b9b5e2cf265838259066687b5ccb7d8527bdd' 
  AND token = 'l84fcQLOiiIFsTaEQ7QgpxOjK+jjHB4ANZE42z40CjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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