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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4983ae65b1ca79e5c35babea9da15d8244f42bc3f252254176bd0910b8aa235e' 
  AND token = 'XOoAXH3n/BpHHpKhGzXTs/Bzk0hiufZ7f4P6YTY0pro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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