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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8fa2fe36de43912d43d4ea1b6874317528b275cab4d3f5056252e3c62b79fa' 
  AND token = 'ZI+rGXSqKq2rAIOrlUFdJrdeznLHLWXFqWkuT4LnYaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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