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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c741d812c4d2496176d8acc44e3f62f04543dc205185cb4265d04dd2ea6b4f9' 
  AND token = '8GgLy+J7DB24u8uv86xXSChzacJmNMx83wrbtzdUScI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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