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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12d1257572b8d8023c02e64557492989c43575fb1213144895cd0759bd467fe' 
  AND token = '3v1FmTir7uC9MUi07sFGaoAn3PJwApDFFU7QD7bG/0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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