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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69804eb15ab90583f3cc6c2cbdb6dff4cf05eeaa0e5a594880ee83a16c7cbbe2' 
  AND token = 'hJkxIgsqH8cfAFb9Kp1J3A20nFj+AUaj6U4eiLuv58c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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