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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a46b5a2765399b763978e1f85111468d96f2c312e4e4f986735836a76223fd' 
  AND token = 'et95OusGYB9AEcGxDQoM2S8MnftceXTXtYEs+ccVaKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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