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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c8c4b076a0e21abe2439feaa97de045e2e347fe398a5f667653a3660f17ffd' 
  AND token = 'B4F20Pf7nRrJiTjcIDiBViUra+xOgdYEJC46Ud0VV+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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