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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cae171cc152225239b7348f381e6a005aee3d593f02ccb238c45c3b333eca01' 
  AND token = 'zKemiy14oRbrwcfPAtDpJ/M1u5OAaBzm06VZqU0IMbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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