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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda021132adf5334ab22dc7c2738de1923167040c0315f30c4419253bb516ff8' 
  AND token = 'aUHqBQpX4UYH97J3uC3nDLdM0r6/lGzTnaooiI/iI7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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