SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a082dc11876c11345bdb7dd3d189502a737546009eaf9d6246899fab65c9aa' 
  AND token = 'Bx4s+vy+CpyHWPIzTmPaQzB0VdwiJH4xLAbBbDwUWSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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