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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33054ad6d9725e219ee36ab0036d1b14183537c655253d1eedfd0cc68023761' 
  AND token = 'gsLTbkG3zNX6ka86DIxhfMagpq3cjkM2R+zWwjUlHg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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