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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eee5f9b7bfa8f1b40326874bd2de16d3f43228d26686cb8a53cdef54d2ed62' 
  AND token = 'Xy+xYYrLWTj4hDQHWbaZ98tbpHFXv0YDnY8aA4cIhrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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