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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9667d7a831bc61cfa2c9d8199cb72dc5183610d3b687518cc1f92aa0ecbca35b' 
  AND token = 'R3pqDlwU5QuLnZ0ROWPwGDvw0DNpr9yDh06Pwde20Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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