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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0359b3db23b1b85cc852abe42c467afb42d45ebb2a814f35741366f6b1a7c929' 
  AND token = 'poc5lMS5ILtU0MrFV0cXMv/OgdcnGBy6jbHT5NInz+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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