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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3f1d2e28d66ef8700dd0cf7bb0bc776bd6b7036778c58e99f46d0e9eaecadc' 
  AND token = '1++raRf4FvLXoR2XgZVeL25d/Ppbti2H3YKVTKE/OJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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