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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8696d35a49e534ec49f76acaa9e059bcfb1c16393448689cdf52c726208e16b' 
  AND token = '0BBee8zdeKHiCaYiw1JqkwboaHi2JM2nFUDuW2WCMo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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