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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e327ae6f9a1a23259f1855853be4957b7b6f718b82e75bfbcf0178a1f04cc1' 
  AND token = 'BtxiSKgyk+hv9pwtH55IozMEXJGnGWrc7p6w4XeOXUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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