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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd789cfc95d8210fd222da49a887d5f8abf1baef119e91c143025127cf6fed970' 
  AND token = 'Wy/Kw+TvAC1OM2P4VrO+shGq/l6t3I6s//j19TDG64w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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