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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d291785e796fdc4f5e5e7d932d6415cd3dc2e6c7ea79ce60dd3d6a2e6e86aa' 
  AND token = 'Lnb8tIBwsCNO9UCvCChunVBzbp6psF7KByRdvMZA5Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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