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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b06efc04b2c78c6032eddc14d0b831d2e8dc1010d1d19783bab96233fed9654' 
  AND token = 'iBrG0N7eGW1inhCI1OMcATt7ay6UXgmfW/qkIyADM/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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